1. They always are having parties until the early hours of the morning. (Đúng)
2. Pam and Simon have invited us to a dinner. (bỏ a)
3. Would you like me helping you with your homework? (helping -> to help)
4. The prisoners were left in a small island, with neither food nor drinking water. (in->on)
5. She was taking a picture about the children.  (about -> of)
6. Last week my mother was visiting her sister, so I stayed with my aunt. (Đúng)
7. Mr. Michael has dug his garden when Chris got back from work. (Đúng)
8. Greg is always forget his keys and that really annoys me. (forget -> forgets)
9. There was a cat sitting in the middle to the road.     (to -> of)
10. We did a lot of sightseeings when we were in London.         (sightseeing -> sightseeing)